Sub-Zero not cooling properly

I have a Sub-Zero with bottom freezer. Every year we have to call a repairman to come to the house because the fridge portion is not cooling. The freezer portion is making ice and working just fine. The repairman does fix it but we don't know what he is doing to fix it. At $600.00 a visit we really would like to get some suggestions on what to try ourselves, suggestions????

If the light keeps coming back on and temps are rising in the refer section, then you most likely have an evaporator leak. Check to see if you see either a moist spot or ice on the back wall on the left side of the back wall of the refer. If you do, it's definetly a leak. Call a authorized Servicer. If the guy you have had in the past keeps coming back every year, the he is either recharging the unit without changing the evaporator or you have a leak somewhere else. Call a authorized Servicer.

It's a definitely evaporator leak...Cheapest thing - your tech should recharge freon with some add on as a Stop Leaker or something. Any appliance parts supplier has it. Usually it's good enough and working long time, more than one year :)

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Most model numbers are located in places like the photo shows below. It may be the thermostat itself causing the problem with freezer, yet I don't believe I have seen a refrigerator running without using the freezer to cool the refrigerator section. I guess anythings possible. Let me know, Thanks, Sea Breeze

Just a guess, but I would check the gasket on the door. They can go bad or get distorted and bunch up and cause the door to bind and not close properly. Also check that the fridge is leveled properly. Will the door close if pushed? Will it stay closed?